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+A 66 year old patient with a history of UC treated by mesalazine since 5 years consulted in July 2012 for a painful erythematous swelling of the back of the right hand.
+The bacteriological samples were negative, the lesion was considered as an abscesses and the patient was treated with antibiotics and local antiseptics without improvement.
+The evolution was characterized by the appearance of an erythematous vesiculobullous centrifugal expansion taking the whole back of the right hand treated several times by various antibiotics unsuccessfully.
+Biopsy of this lesion was initially not specific.
+In October 2012, the patient was hospitalized for fever and polyarthralgia in the context of impaired general condition.
+He had a quiescent UC disease.
+The skin examination found an erythematous plaque of 10 cm of diameter, with a raised border and vesicules, taking the back of the right hand and wrist (Figure 1).
+There was also an infiltrated erythematous plaque on the right leg (Figure 2) and another topped with a large pustule at the left ankle (Figure 3).
+In biology, there was a biological inflammatory syndrome and high leukocytosis with neutrophils.
+Hepatic and renal functions were normal.
+Skin biopsy showed at the edge of the back of the closet right hand ulcerated epidermis and the dermis infiltrate rich in neutrophils with leukocytoclastic vasculitis finding a PG (Figure 4).
+Other biopsies taken at infiltrated erythematous plaques of the ankle showed a normal appearance of skin, edema of the superficial dermis based on an infiltrate rich in neutrophils without vasculitis confirming the diagnosis of SS (Figure 5).
+Corticosteroid treatment was then started with prednisolone at a dose of 1mg/Kg/j.
+The evolution was marked since day 7 of treatment by the desinfiltration of the plaques (Figure 6), the recovery of the general condition and disappearance of biological inflammatory syndrome.